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cond-op-not.mk revision 1.7 
      1  1.7  rillig # $NetBSD: cond-op-not.mk,v 1.7 2021/01/19 17:49:13 rillig Exp $
      2  1.1  rillig #
      3  1.5  rillig # Tests for the ! operator in .if conditions, which negates its argument.
      4  1.1  rillig 
      5  1.3  rillig # The exclamation mark negates its operand.
      6  1.3  rillig .if !1
      7  1.4  rillig .  error
      8  1.3  rillig .endif
      9  1.3  rillig 
     10  1.3  rillig # Exclamation marks can be chained.
     11  1.3  rillig # This doesn't happen in practice though.
     12  1.3  rillig .if !!!1
     13  1.4  rillig .  error
     14  1.3  rillig .endif
     15  1.3  rillig 
     16  1.3  rillig # The ! binds more tightly than the &&.
     17  1.3  rillig .if !!0 && 1
     18  1.4  rillig .  error
     19  1.3  rillig .endif
     20  1.1  rillig 
     21  1.6  rillig # The operator '==' binds more tightly than '!'.
     22  1.6  rillig # This is unusual since most other programming languages define the precedence
     23  1.6  rillig # to be the other way round.
     24  1.5  rillig .if !${:Uexpression} == "expression"
     25  1.5  rillig .  error
     26  1.5  rillig .endif
     27  1.5  rillig 
     28  1.5  rillig .if !${:U}
     29  1.5  rillig .  info Not empty evaluates to true.
     30  1.5  rillig .else
     31  1.5  rillig .  info Not empty evaluates to false.
     32  1.5  rillig .endif
     33  1.5  rillig 
     34  1.5  rillig .if !${:U }
     35  1.5  rillig .  info Not space evaluates to true.
     36  1.5  rillig .else
     37  1.5  rillig .  info Not space evaluates to false.
     38  1.5  rillig .endif
     39  1.5  rillig 
     40  1.5  rillig .if !${:U0}
     41  1.5  rillig .  info Not 0 evaluates to true.
     42  1.5  rillig .else
     43  1.5  rillig .  info Not 0 evaluates to false.
     44  1.5  rillig .endif
     45  1.5  rillig 
     46  1.5  rillig .if !${:U1}
     47  1.5  rillig .  info Not 1 evaluates to true.
     48  1.5  rillig .else
     49  1.5  rillig .  info Not 1 evaluates to false.
     50  1.5  rillig .endif
     51  1.5  rillig 
     52  1.5  rillig .if !${:Uword}
     53  1.5  rillig .  info Not word evaluates to true.
     54  1.5  rillig .else
     55  1.5  rillig .  info Not word evaluates to false.
     56  1.5  rillig .endif
     57  1.5  rillig 
     58  1.7  rillig # A single exclamation mark is a parse error.
     59  1.7  rillig .if !
     60  1.7  rillig .  error
     61  1.7  rillig .else
     62  1.7  rillig .  error
     63  1.7  rillig .endif
     64  1.7  rillig 
     65  1.1  rillig all:
     66  1.1  rillig 	@:;
     67